ICS doesn't work after computer or service restart on Windows 10

Summary

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Consider the following scenario:

• You have a Windows 10 Version 1607, Windows 10 Version 1703, or Windows 10 Version 1709-based computer that has two network interfaces that connect to two different networks.
• You change the Internet Connection Sharing (ICS) service Startup type to Automatic.
• You enable ICS on one of the network interfaces and then confirm that ICS connection works.
• You restart the ICS service or the computer.

In this scenario, the ICS settings are lost, and the ICS connection doesn't work.

Note Generally, if there is no traffic on ICS for 4 minutes, the service shuts down and does not restart automatically.

Resolution

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Warning

Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Note This solution is currently available only in Windows 10 Version 1709 with update KB 4054517installed.

To fix this issue, set the following registry subkey:

Path: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\SharedAccess
Type: DWORD
Setting: EnableRebootPersistConnection
Value: 1

Then, change the ICS Service Startup mode to Automatic.